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



Hexadecimal 0 1 2 3 4 5 6 7 8 9 A B C D E F

Debug Code

LED display

0 1 2 3 4 5 6 7 8 9 A B C D E F

Boot Phases



 – memory initialization

 – main hardware initialization



bootable device (CD/DVD, HDD, USB, Network, Shell, …)





01 Power on. Reset type detection (soft/hard)

02 AP initialization before microcode loading

03 System Agent initialization before microcode loading

04 PCH initialization before microcode loading

06 Microcode loading

07 AP initialization after microcode loading

08 System Agent initialization after microcode loading

09 PCH initialization after microcode loading

0B Cache initialization



 Reserved for future AMI SEC error codes

0E Microcode not found

0F Microcode not loaded



10 PEI Core is started

11 

12 - 14 

15 

16 - 18 

19 

 

2B Memory initialization. Serial Presence Detect (SPD) data reading

 Memory initialization. Memory presence detection

2D Memory initialization. Programming memory timing information

Other manuals for MSI MEG B550 UNIFY

Quick Start82 pages

Manual230 pages

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MSI MEG B550 UNIFY Specifications

General

Processor socket	Socket AM4
Processor manufacturer	AMD
Compatible processor series	AMD Ryzen 3, AMD Ryzen 5, AMD Ryzen 7, AMD Ryzen 9 3rd Gen
Maximum number of SMP processors	1
ECC	Yes
Memory channels	Dual-channel
Memory slots type	DIMM
Number of memory slots	4
Supported memory types	DDR4-SDRAM
Maximum internal memory	128 GB
Supported memory clock speeds	1866, 2133, 2400, 2667, 2800, 2933, 3000, 3066, 3200, 3466, 3600, 3733, 3866, 4000, 4133, 4266, 4400, 4533, 4600, 4733, 4866, 5000, 5100, 5600 MHz
RAID levels	0, 1, 10
Supported storage drive types	HDD & SSD
Number of storage drives supported	10
Supported storage drive interfaces	M.2, SATA
DirectX version	12.0
Maximum resolution	4096 x 2160 pixels
Maximum graphics card memory	16384 MB
Parallel processing technology support	2-Way CrossFireX
USB 2.0 connectors	2
Number of SATA II connectors	0
Number of SATA III connectors	6
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity	3
LAN controller	Realtek RTL8125B
Wi-Fi standards	802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 6 (802.11ax)
Bluetooth version	5.1
Top Wi-Fi standard	Wi-Fi 6 (802.11ax)
WLAN controller model	Intel Wi-Fi 6 AX200
Ethernet interface type	2.5 Gigabit Ethernet
Audio chip	Realtek ALC1220P
Component for	PC
Motherboard chipset	AMD B550
PC health monitoring	FAN, Temperature
Audio output channels	7.1 channels
Motherboard form factor	ATX
BIOS type	UEFI AMI
Cables included	SATA
Harmonized System (HS) code	84733020
Weight	1000 g